THORIUM IN WATER AND ALGAE FROM THE ADRIATIC SEA

Thorium concentrations were determined in filtered (0.45‐ µ Millipore) and unfiltered seawater as well as in marine algae. In filtered seawater, values were 8 × 10 −13 g Th liter −1 and lower; for unfiltered seawater samples, values about three orders of magnitude higher were obtained. Thorium concentrations in marine algae are in the range of 10 −6 to 10 −8 g Th g −1 ashed material.